Climate Maps

Climate Maps for Illinois

Precipitation

High Temperature

Low Temperature

Growing Season (Length and Frost Dates)

Back to the homepage

This is a series of climate maps for Illinois based on the 1971-2000 time period, the standard time period for describing the "normal" climate of Illinois. Normals for individual sites can be found at station summaries. Some of the monthly maps are not available when there are too few data, for example snowfall in June.

Precipitation (inches)
January February March April May June July	August September October November December Annual

Mean Daily High Temperature (degrees F)
January February March April May June July	August September October November December Annual

Mean Daily Low Temperature (degrees F)
January February March April May June July	August September October November December Annual

Snowfall (inches)
January February March	November December Annual

Heating Degree Days
January February March April May June July	August September October November December Annual

Cooling Degree Days
April May June July	August September October Annual

Growing Degree Days
April May June July	August September October Annual

Growing Season Statistics

See frost and growing season page

The data used in these products come from the National Weather Service (NWS) Cooperative Observer Program (COOP). This network of more than 11,000 volunteer observers nationwide, using approved instruments and observing techniques, provides high-quality climate data to the nation. The data are archived at the National Climatic Data Center (NCDC).